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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:01,930 --> 00:00:09,460 What problem or problems do you see with everybody creating their own engines in JavaScript, just like 2 00:00:09,460 --> 00:00:09,940 we did? 3 00:00:09,940 --> 00:00:10,480 Right? 4 00:00:10,780 --> 00:00:15,100 Can we just create our own engine and all of a sudden, boom, there it is. 5 00:00:15,100 --> 00:00:16,510 We have our JavaScript engine. 6 00:00:17,260 --> 00:00:19,390 Well, yes, you can definitely do that. 7 00:00:19,780 --> 00:00:27,520 But remember our list over here how it was called script engines and not JavaScript engines. 8 00:00:28,670 --> 00:00:34,800 That's because if everybody can just create a JavaScript engine, it'll just be total chaos, which 9 00:00:34,800 --> 00:00:36,930 is why a script was created. 10 00:00:37,500 --> 00:00:43,620 It tells people, Hey, here's the standard and how you should do things in JavaScript and how it should 11 00:00:43,620 --> 00:00:44,220 work. 12 00:00:44,760 --> 00:00:52,110 And the script is the governing body of JavaScript that essentially decides how the language should 13 00:00:52,110 --> 00:00:53,070 be standardized. 14 00:00:53,720 --> 00:01:02,810 So it tells engine creators this is how JavaScript should work, but internally how you build the engine 15 00:01:02,810 --> 00:01:06,470 is up to you as long as it conforms to the standards. 16 00:01:08,180 --> 00:01:15,140 And if we go back to our example over here, this engine inside of this box, as long as it conforms 17 00:01:15,140 --> 00:01:21,020 to my script standards, I can do whatever I want as an engine creator. 18 00:01:21,780 --> 00:01:28,500 So companies and organizations are battling to have the fastest engine so people use their tool. 19 00:01:28,680 --> 00:01:34,680 For example, Google is really interested in having the fastest engine so that more people use their 20 00:01:34,680 --> 00:01:40,350 Chrome browsers, so that they use their search engine so that they can sell more ads and make more 21 00:01:40,350 --> 00:01:40,920 revenue. 22 00:01:41,650 --> 00:01:49,300 But keep this in mind that this can be implemented any way we want and it constantly changes to find 23 00:01:49,300 --> 00:01:56,260 the fastest way possible to have JavaScript work in our browsers or even outside of our browsers. 24 00:01:57,120 --> 00:02:01,980 And we're going to be talking about the V8 engine here because it is the most popular. 25 00:02:02,100 --> 00:02:05,040 And you might see some different variations of this. 26 00:02:05,040 --> 00:02:10,560 But what we're going to talk about here applies to most JavaScript engines. 27 00:02:11,130 --> 00:02:17,490 And although things may change over time, as long as you understand the principles and why it's built 28 00:02:17,490 --> 00:02:21,900 the way it is, we're going to be able to understand how to write optimized code. 29 00:02:22,410 --> 00:02:26,400 But before we get into that, let's talk about what these things are. 30 00:02:26,430 --> 00:02:29,010 We have the interpreter and the compiler. 31 00:02:29,780 --> 00:02:31,280 I'll see you in the next video. 32 00:02:31,580 --> 00:02:32,150 Bye bye. 3298